Deuteronomy 32:41

⁴¹ If I shall whet my sword as the lightning, and my hand take hold on judgment: I will render vengeance to my enemies, and repay them that hate me.

One field rained upon and one not

In Amos 4:7, this signifies the doctrine of faith from charity, and the doctrine of faith without charity. (Arcana Coelestia 382[2])